Remove oauth_cb workaround for KIP-768 support

Fixes #71.

See nasa-gcn/gcn-kafka-python#22.

Author: lpsinger

adc/auth.py

@@ -64,6 +64,7 @@ def __init__(self, user, password, ssl=True, method=None, token_endpoint=None, *
             self._config = {
                 "security.protocol": "SASL_SSL",
                 "ssl.ca.location": ssl_cert,
+                "https.ca.location": ssl_cert,
             }
             if "ssl_endpoint_identification_algorithm" in kwargs:
                 self._config["ssl.endpoint.identification.algorithm"] = \

adc/consumer.py

@@ -14,7 +14,6 @@
 
 from .auth import SASLAuth
 from .errors import ErrorCallback, log_client_errors
-from .oidc import set_oauth_cb
 
 
 class LogicalOffset(enum.IntEnum):
@@ -360,5 +359,4 @@ def as_ms(td: timedelta):
 
         if self.auth is not None:
             config.update(self.auth())
-        set_oauth_cb(config)
         return config

adc/oidc.py

@@ -3,11 +3,9 @@
 
 # requirements
 install_requires = [
-    "authlib",  # FIXME: drop after next release of confluent-kafka with OIDC support
-    "confluent-kafka >= 1.6.1, != 2.1.0, != 2.1.1",
+    "confluent-kafka >= 2.11.0",
     "dataclasses ; python_version < '3.7'",
     "importlib-metadata ; python_version < '3.8'",
-    "requests",  # FIXME: drop after next release of confluent-kafka with OIDC support
     "tqdm",
     "certifi>=2020.04.05.1",
     "typing-extensions ; python_version < '3.8'",